This question is based on the network and of the OSI reference model.

$1$

$.$

$$What is the function of the DNS and DHCP protocols in computer networks?

$2$

$.$

$$Explain in detail about the different classes of IPv

$4$

$$addresses$.4$ Marks

$3.$ You are provided with $255\mathrm{.}255\mathrm{.}255\mathrm{.}224$ as a subnet mask for your work. write down the number of networks and hosts per network that can be provided by this mask. $4$ marks

$4.$ You are called for a computer networking job interview at MTN$.$ During the interview session, they give you a piece of paper with $221\mathrm{.}200\mathrm{.}144\mathrm{.}5/25$ written on it$.$ They then ask you the following questions.

a$)$ what is the significance of the $/25$ indicated at the end of the IP address? $1$ Mark

b$)$How many networks can you get from $222\mathrm{.}200\mathrm{.}144\mathrm{.}5/25?$

c$)$ write down the network address the first of the second network. $2$ Marks

d$)$ Write dow the broadcast address of the first netwrok. $2$ Marks

e$)$ what is the valid host range of the last network? $2$ Marks